S-90298A630 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ensuring longevity in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high-stress conditions
• Precise alignment and smooth rotation enabled by the 1-3/4" shoulder with tight diameter tolerance of -0.001" to 0.001"
• Secure and easy installation with a knurled hex socket head providing excellent grip and torque transmission
• Consistent thread engagement through Class 3A thread fit and 5/16"-18 UNC coarse threads for vibration resistance
• Regulatory compliance assurance meeting ASME B18.3 standards and RoHS/REACH environmental directives
• Versatile industrial compatibility with standard inch measurements making it suitable for various machinery and equipment

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw delivers critical engineering value in applications requiring precise component alignment and rotational movement. The 1-3/4" precision shoulder with minimal diameter tolerance ensures accurate positioning in assemblies, while the Class 3A thread fit provides secure fastening in high-vibration environments. The passivated finish on the stainless steel base material offers enhanced protection against chemical exposure and oxidation, making it ideal for food processing equipment, precision machinery, and automotive assemblies. The knurled hex socket head allows for efficient installation in confined spaces, and the 70,000 psi tensile strength guarantees structural integrity in demanding applications where failure is not an option.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit and UNC coarse thread profile (5/16"-18) for optimal engagement. The shoulder maintains precise dimensional control with diameter tolerance of -0.001" to 0.001" and length tolerance of -0.005" to 0.005". This shoulder screw conforms to ASME B18.3 specifications and demonstrates compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications.